v3.26.1
PENSION BENEFITS - Schedule of Components of Net Periodic Pension Cost (Details) - Pension Plan - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits        
Service cost $ 1,977 $ 1,661 $ 3,954 $ 3,322
Interest cost 13,787 15,293 27,574 30,587
Expected return on plan assets (15,302) (15,282) (30,660) (30,564)
Amortization of actuarial loss 5,460 4,892 10,921 9,783
Amortization of prior service credit (486) (486) (972) (972)
Net periodic pension cost 5,436 6,078 10,817 12,156
Qualified Plans        
Pension Benefits        
Service cost 1,977 1,661 3,954 3,322
Interest cost 11,930 13,217 23,860 26,434
Expected return on plan assets (15,302) (15,282) (30,660) (30,564)
Amortization of actuarial loss 4,482 4,026 8,965 8,052
Amortization of prior service credit (486) (486) (972) (972)
Net periodic pension cost 2,601 3,136 5,147 6,272
Non- Qualified Plans        
Pension Benefits        
Service cost 0 0 0 0
Interest cost 1,857 2,076 3,714 4,153
Expected return on plan assets 0 0 0 0
Amortization of actuarial loss 978 866 1,956 1,731
Amortization of prior service credit 0 0 0 0
Net periodic pension cost $ 2,835 $ 2,942 $ 5,670 $ 5,884